Answer:
The circumference of the circle is 26.4 cm
The area of the circle is 55.44 cm²
Explanation:
The circumference of the circle C = 2πr
The area of the circle A = πr²
r is the radius of the circle
∵ r = 4.2 cm
→ Substitute it in the first rule to find the circumference
∵ C = 2πr
∵ π =
∴ C = 2 ×
× 4.2
∴ C = 26.4 cm
∴ The circumference of the circle is 26.4 cm
∵ A = πr²
∵ r = 4.2 cm
∵ π =
→ Substitute them in the second rule to find the area
∵ A =
× (4.2)²
∴ A = 55.44 cm²
∴ The area of the circle is 55.44 cm²